Dipper for steam-shovels.



W. F. MCMONEGAL. DIPPER FOR STEAM SHOVELS' APPLICATION FILED SEPT. 7. 1917.

Patented Mar. 5, 1918.

2 SHEETSSHEET I.

5 11.7 Vg :1 Yam (2X w. F. McMONEGAL. DIPPEH FOR STEAM SHOVELS- APPLICATION FILED SEPT- 7; 19'7- 7 1,258,585. Patented Mar. 5, 1918.

2 SHEETS-SHEET 2- NN a/Il MQQQ NN M m M n Ill- WILLIAI I. IOHONEGAL, OF HAZLETON, PENNSYLVANIA.

DIIPEB FOB STEAM-SHOVELS. 7

Specification of Letters Patent.

Patented Mar. 5, 1918.

Application filed September 7, 1917. Serial No. 190,205.

To all whom it may concern:

Be it known that I, WILLIAM F. MCMONE- GAL, a citizen of the United States, residin at Hazleton, in the county of Luzerne and State of Pennsylvania, have invented new and useful Improvements in Dippers for Steam-Shovels, of which the following is a. specification.

This invention relates to a dipper for a steam shovel and more especially to the construction of the element commonly known as the front sheet of the dipper.

The object of the invention is to provide improved means for mounting the teeth projecting from the edge portion of the dipper, permitting their prompt renewal when required.

A further object is to provide certain novel means for locking the detachable teeth in position when mounted within the guidin means provided for the shank portion 0 the teeth.

A still further object is to provide certain novel means for mounting the heel plate at the rear of the so called front sheet, this heel late being engaged by the locking means or securing the gate.

A still further ob'ect is to provide for the reinforcement of t e rear portion of the front sheet in the manner herein described.

With the foregoing and other objects in view, the invention consists in the novel construction, combination and arran ement of elements hereinafter described an claimed.

In the accompanyin drawings:

Figure 1. is a top p an view of the front sheet of the dipper with the teeth mounted thereon.

Fig. 2 is a view in side elevation of the structure shown in Fig. 1.

Fi 3 is a vertical section on the line 3-3 of Fig. 1.

Fig. 4 is an end viewlooking from the ri ht in Fig. 1.

ig. 5 is a transverse section on the line 5-5 of Fig. 1.

Fig. 6 is a top plan view of one of the teeth and the mounting means'therefor.

Fig. 7 is a view of one of the teeth in side elevation.

Fig. 8 is a to plan view of one of the teeth showin t e mounting means, and aportion of t e adjacent structure broken awa 9 is a further view of a tooth in side sheet is provided with a cutaway elevation, a portion of the front of the sheet of the dipper being shown in section.

Figs. 10 and 11 are views of the key for securing the teeth in position.

Fig. 12 is a top plan view of the heel plate and means for retaining the latter in posltion.

Fig. 13 is an edge view of the heel plate with the retaining means therefor.

Fig. 14 is an end view of the structure shown in Fig. 12.

Figs. 15 and 16 show details of construction described below.

The improvements herein described relate to that element of the dipper termed the front sheet and this member is designated 10 in Fig. 1 and elsewhere and is of the usual configuration so far as the body portion thereof is concerned, but I prefer to form this sheet with a thicker rear portion than is usually provided for the purpose of adding sufficient strength. The relative thicknesses of various portions of the sheet would depend upon the size of the dipper, but for a given size the thicknezq of the sheet at the rear portion may be three inches and from the central portion toward the front of the sheet about two inches.

In mounting the teeth I retain all p0 tions of the sheet 10 intact roviding no apertures or openings of any c aracter, and thereby avoid weakening the sheet and also avoiding the wear of securing devices, when the latter are employed and are arran ed to pass entirely through the sheet and exposed on the lower surface thereof.

The teeth are designated 12 and may be of substantially the same width from the front to the rear portion, but are thicker at a point adjacent to the edge of the front sheet 10, for the urpose of roviding suflicient strength at t at point. The forward end of each tooth is beveled and a slot is provided as shown at 14 for engaging the front edge of sheet 10. The tooth is beveled long tudinally as indicated in Fig. 5 and elsewhere, so that the shank portion of the tooth is narrower at the top than at the base. This beveled portion is designated 15, forming a dove-tail connection with the guides 16 extending longitudinally and adapted to retain the teeth in position. The edge of the rtion at adcjlacent the forward en s ofeach a oint P es 16, this cutaway portion being pair ofgui shown at 18 and permitting the tooth to be further engaged at the point indicated.

Each tooth is provided near its rear end with a transverse slot 20 adapted to be engaged by the key 21 shown in Figs. 10 and 11, this key being provided with a slit 22 along one edge for the purpose of permitting the extreme edges 23 to be deflected after the key is inserted, thereby retaining the key in position. A larger key may be employed in view of a certain amount of play allowed in slot 20, this key being required when the wear at the point of engagement between the front of the tooth and the edge of plate 10 necessitates some provision for taking up any movement between the elements which might otherwise result. The key 21 is also provided with apertures 24. which may be engaged by any I suitable tool for withdrawing the key after the deflected edges 23 have been flattened when the tooth is to be withdrawn for renewal or the like. By means of this construction I provide for the prompt removal of the teeth whenever required and the tooth may be reinserted if suitable for continued use and the key may also be used a number of times. which the teeth are formed as a part-of the dipper front, a broken tooth seriously interferes with the operation of the device, and several broken teeth renders necessary the renewal of the entire front. It may be added that the end portions of the guides are under-cut as shown at 26 and the keys engage the walls 27 of the under-cut portions, the deflected edges of the keys when secured, engaging the other walls of the cutaway portions. An unusually eflicient locking device is thereby provided.

In Figs. 2 and 3 the rivet holes for securing the front sheet 10 to the upper portion of the dipper are shown at 29. I

The teeth 12 are set in such position that the space between the teeth at a point adjacent to the edge of sheet 10 is greater than the space'between the front portions of the teeth. When employing a tooth of average size the difference may be about one inch. The object of this additional space is to prevent stones from becoming wedged between the teeth at the rear portions thereof, a stone of a given size which may be admitted between the front portions of the teeth becoming free as it passes rearwardly.

I have also rovided certain novel'means for mounting t e heel plate 32 which is ordinarily secured by means of rivets 33 passing entirely through the sheet 10. When these In that form of construction inrivets become worn off the heel plate is detached and the shovel cannot be used until they are replaced. In addition to employing rivets such as those shown at 33, I provide a retaining device 34 having a cutaway portion 35 therein corresponding in dimensions with the dimensions of the heel plate. The side walls are undercut as shown at 36 and engage the beveled sides of the heel plate, thereby retaining the latter in position when the rivets give way, and permitting-the use of the dipper until the close of a ays work when the rivets may be re newed. The end of the heel plate is rovided with the usual aperture 38 whic is engaged by the latch of the swinging gate for dumping the contents of the dipper. The latch and gate are not shown, forming no portion of the present invention.

What, is claimed is:

1. In a device of the class described, a dipper member having an unobstructed outer surface, guides carried by the inner surface thereof and parallelly arranged in pairs, a detachable tooth mounted between the guides of each pair, the rear ends of the guides being undercut, and securing means passing through the teeth and located in the undercut portion.

2. In a device of the class described, a dipper member having an unobstructed outer surface, guides formed in pairs and extending longitudinally of the inner surface of the dipfier adjacent to one edge thereof, teeth eac formed with a shank portion and slotted longitudinally, and providing a member engaging the outer surface of the dipper, the main ortion of the shank engaging the inner sur ace thereof and being retained by the aforesaid guides and slidable means engaging the ends of the guides and securing the teeth in position,

said means bein free from engagement with the dipper mem er. v

3. In a device of the class described, a dipper having an unobstructed outer surface and imperforate and formed with a plurality of guides on the inner surface, teeth arranged in said guides and said teeth includinga portion engaging the outer surface of the dipper, and key members for securing the teeth within the ides and comprising a strip provided wit a slit in one edge thereof, permitting said edge to be deflected for securing the key in position, said guides projecting over the key members and protecting the latter.

In testimony whereof I aflix my signature.

WILLIAM F. MoMONEGAL. 

